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He confirmed the pair were found by Ms Bendel's husband and another child about midday on Monday. They were both also shocked.

The farm at Tumoulin near Ravenshoe south of Cairns. (9NEWS)

The husband performed CPR until paramedics arrived but the pair could not be revived.

“Accidents can happen at almost any time… the same sort of thing day after day it’s just dreadful circumstances that can lead to deaths in a family like this,” Tablelands regional major Joe Paronella said.

Police are treating the incident as an accident. A report will be prepared for the Coroner.